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sleep & Co on Linux (was: disown, fg, jobs)

From: Sven Mascheck
Subject: sleep & Co on Linux (was: disown, fg, jobs)
Date: 21 Jun 2001 15:28:34 +0200
User-agent: tin/1.4.5-20010409 ("One More Nightmare") (UNIX) (SunOS/5.8 (sun4u))

Paul Jarc <address@hidden> wrote:
> Dan Jacobson <address@hidden> writes:

>> Is there something funny going on here in bash 2.04?:
> No, that output looks normal.

It looks rather unexpected.
AFAIK, this only happens on Linux.

> [...] don't expect us to guess what.

I agree with you, he could have been more to the point.

The example was also misleading (not related with disown),
on Linux it's just:

$ sleep 100
[1]+ Stopped    sleep 100
$ fg

I.e., the sleep(1) is *terminating* on SIGCONT (it sort of died
already on SIGSTOP/TSTP).

The reason is sleep(1) using glibc sleep(3) using nanosleep(2).

This would not happen if sleep(1) used alarm(2) or looked at the return
value of sleep(3) (not common practice) - or if bash had a built-in,
doing one of both, like ksh93 (which uses alarm(2) and works fine)


There are too many parties involved (utilities, glibc, kernel), so i guess
this will unecessarily still "live" for a while.


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